Apparatus and method for input channel isolation within an electronic test instrument
First Claim
Patent Images
1. Apparatus, comprising:
- a modulator, for modulating an input signal onto a carrier signal to produce a modulated carrier signal, said modulator being coupled to a first ground reference;
a demodulator, for receiving a representation of said modulated carrier signal and a representation of said carrier signal for demodulating said representation of modulated carrier signal to produce a demodulated signal, said demodulator being coupled to a second ground reference, said first and second ground references being electrically isolated from each other;
an isolator for receiving said modulated carrier signal from said modulator, producing said representation of modulated carrier signal, and conveying said representation of modulated carrier signal to said demodulator while maintaining said isolation of said first and second ground references; and
a filter, for retrieving a corresponding input signal from said demodulated signal.
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Abstract
An electrical isolation device wherein a signal to be electrically isolated is mixed with a carrier signal by a multiplier to produce a modulated carrier signal which is passed through an isolation barrier and demodulated and filtered to extract thereby the initial input signal.
31 Citations
11 Claims
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1. Apparatus, comprising:
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a modulator, for modulating an input signal onto a carrier signal to produce a modulated carrier signal, said modulator being coupled to a first ground reference; a demodulator, for receiving a representation of said modulated carrier signal and a representation of said carrier signal for demodulating said representation of modulated carrier signal to produce a demodulated signal, said demodulator being coupled to a second ground reference, said first and second ground references being electrically isolated from each other; an isolator for receiving said modulated carrier signal from said modulator, producing said representation of modulated carrier signal, and conveying said representation of modulated carrier signal to said demodulator while maintaining said isolation of said first and second ground references; and a filter, for retrieving a corresponding input signal from said demodulated signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A test and measurement instrument, comprising:
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a modulator, for modulating an input signal onto a carrier signal to produce thereby a modulated carrier signal, said modulator being coupled to a first ground reference; a demodulator, for receiving a representation of said modulated carrier signal and a representation of said carrier signal for demodulating said representation of modulated carrier signal to produce a demodulated signal, said demodulator being coupled to a second ground reference, said first and second ground references being electrically isolated from each other, an isolator for receiving said modulated carrier signal from said modulator, producing said representation of modulated carrier signal, and conveying said representation of modulated carrier signal to said demodulator while maintaining said isolation of said first and second ground references; and a filter, for retrieving a corresponding input signal from said demodulated signal.
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Specification